Book/Report

FZJ-2019-02560

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Untersuchung eines Methanolreformerkonzepts unter den besonderen Bedingungen der Dynamik und Langzeitstabilität beim Einsatz im Brennstoffzellen-Pkw

Düsterwald, H. G. (Corresponding author)FZJ*

1997
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/22061

Report No.: Juel-3452

Abstract: All over the world, research and development programs concentrate on new propulsion systems for passenger cars with PEM-Fuel Cell (Proton Exchange Membrane) systems, hydrogen production unit on-board, and electric motor. The objectives of this thesis are the investigation of the dynamic methanol-reformer behavior and simulation calculations of the fuel-cell powered propulsion system. The methanol reformer as a key component in terms of the dynamics of the whole system, the start-up conditions and the stability of the reforming catalysts are experimentally investigated in great detail. The experimental results are then integrated and analysed within the framework of the simulation calculations. In addition, further system components such as gas treatment, catalytic burner, fuel cell and electric motor are simulated as well. By varying the length of the catalyst bed, it could be shown that when starting the operation, the methanol reforming process occurs within the first centimeters of the catalyst bed. Due to the endothermic reaction, there is a sharp temperature drop of about 50 K within the first catalyst layer. The specific hydrogen production within the first 10 centimeters of the catalyst bed is relatively high (9,6 Nm31(h kgr,)). The methanol conversion is about 45 %. With increasing operation time, the most active reaction zone moves along the catalyst bed. The decrease in catalyst activity with time is almost linear (deactivation rate). Cycled start-up andshut-down processes of the methanol/steam reformer do not harm the catalyst. The catalyst keeps its activity under condensation conditions for methanol and water.The simulation emphasizes the connection between the power requirement at the wheel and the methanol supply to the reformer unit. Because of the system start-up time and the limited reformer dynamics, a hydrogen storage is integrated into the whole fuel-cell powered propulsion system. Characteristic system parameters are described for particular driving cycles. Calculations for the New European Driving Cycle show an equivalent gasoline consumption of 3,8 l/100 kin for a test weight of 1480 kg of a passenger car and an overall efficiency of about 31 %. The results of the methanol reformer investigation as well as the simulation calculations represent not only the progress required in terms of comparability with conventional powertrains, but also a high potential of fuel-cell powered drives in terms of specific energyconsumption data.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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